from unittest.mock import MagicMock

import pytest

from scrapy import signals
from scrapy.exceptions import NotConfigured
from scrapy.signalmanager import SignalManager
from scrapy.statscollectors import StatsCollector
from scrapy.utils.spider import DefaultSpider

pytestmark = pytest.mark.filterwarnings(
    "ignore:The scrapy.extensions.statsmailer module is deprecated:scrapy.exceptions.ScrapyDeprecationWarning",
    "ignore:The scrapy.mail module is deprecated:scrapy.exceptions.ScrapyDeprecationWarning",
)

from scrapy.extensions import statsmailer  # noqa: E402
from scrapy.mail import MailSender  # noqa: E402


@pytest.fixture
def dummy_stats():
    class DummyStats(StatsCollector):
        def __init__(self):
            # pylint: disable=super-init-not-called
            self._stats = {"global_item_scraped_count": 42}

        def get_stats(self):
            return {"item_scraped_count": 10, **self._stats}

    return DummyStats()


def test_from_crawler_without_recipients_raises_notconfigured():
    crawler = MagicMock()
    crawler.settings.getlist.return_value = []
    crawler.stats = MagicMock()

    with pytest.raises(NotConfigured):
        statsmailer.StatsMailer.from_crawler(crawler)


def test_from_crawler_with_recipients_initializes_extension(dummy_stats, monkeypatch):
    crawler = MagicMock()
    crawler.settings.getlist.return_value = ["test@example.com"]
    crawler.stats = dummy_stats
    crawler.signals = SignalManager(crawler)

    mailer = MagicMock(spec=MailSender)
    monkeypatch.setattr(statsmailer.MailSender, "from_crawler", lambda _: mailer)

    ext = statsmailer.StatsMailer.from_crawler(crawler)

    assert isinstance(ext, statsmailer.StatsMailer)
    assert ext.recipients == ["test@example.com"]
    assert ext.mail is mailer


def test_from_crawler_connects_spider_closed_signal(dummy_stats, monkeypatch):
    crawler = MagicMock()
    crawler.settings.getlist.return_value = ["test@example.com"]
    crawler.stats = dummy_stats
    crawler.signals = SignalManager(crawler)

    mailer = MagicMock(spec=MailSender)
    monkeypatch.setattr(statsmailer.MailSender, "from_crawler", lambda _: mailer)

    statsmailer.StatsMailer.from_crawler(crawler)

    connected = crawler.signals.send_catch_log(
        signals.spider_closed, spider=DefaultSpider(name="dummy")
    )
    assert connected is not None


def test_spider_closed_sends_email(dummy_stats):
    recipients = ["test@example.com"]
    mail = MagicMock(spec=MailSender)
    ext = statsmailer.StatsMailer(dummy_stats, recipients, mail)

    spider = DefaultSpider(name="dummy")
    ext.spider_closed(spider)

    args, _ = mail.send.call_args
    to, subject, body = args
    assert to == recipients
    assert "Scrapy stats for: dummy" in subject
    assert "global_item_scraped_count" in body
    assert "item_scraped_count" in body